- any of various aquatic beetles, as a predaceous diving beetle.
Origin of water beetle
First recorded in 1660–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for water beetle
In the great Dyticus water-beetle this is done in a curious way.Chatterbox, 1905.
Compare the antenn with those of the locust and water-beetle.Elementary Zoology, Second Edition
Vernon L. Kellogg
I've found a rather rare species of a water-beetle, Dytiscus marginatus; do you know it?Fathers and Children
Ivan Sergeevich Turgenev
We can fancy this creature propelling itself much in the same way as a “water-beetle” rows itself through the water in a pond.Extinct Monsters
H. N. Hutchinson
In Colymbetes serricornis, a water-beetle, the male has a serrated clava of four joints.An Introduction to Entomology: Vol. III (of 4)
- any of various beetles of the families Dysticidae, Hydrophilidae, etc, that live most of the time in freshwater ponds, rivers, etcSee whirligig beetle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012